package com.pedrouid.crypto;

import android.widget.Toast;

import java.io.IOException;
import java.security.SecureRandom;
import java.util.HashMap;
import java.util.Map;

import java.util.UUID;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.security.InvalidKeyException;

import java.nio.charset.StandardCharsets;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.SecretKeyFactory;
import javax.crypto.Mac;

import org.spongycastle.crypto.ExtendedDigest;
import org.spongycastle.crypto.digests.SHA1Digest;
import org.spongycastle.crypto.digests.SHA224Digest;
import org.spongycastle.crypto.digests.SHA256Digest;
import org.spongycastle.crypto.digests.SHA384Digest;
import org.spongycastle.crypto.digests.SHA384Digest;
import org.spongycastle.crypto.digests.SHA512Digest;
import org.spongycastle.crypto.generators.PKCS5S2ParametersGenerator;
import org.spongycastle.crypto.PBEParametersGenerator;
import org.spongycastle.crypto.params.KeyParameter;
import org.spongycastle.util.encoders.Hex;

import android.util.Base64;

import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.Promise;
import com.facebook.react.bridge.ReactContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.facebook.react.bridge.Callback;

public class RCTHmac extends ReactContextBaseJavaModule {

    public static final String HMAC_SHA_256 = "HmacSHA256";

    public RCTHmac(ReactApplicationContext reactContext) {
        super(reactContext);
    }

    @Override
    public String getName() {
        return "RCTHmac";
    }

    @ReactMethod
    public void hmac256(String data, String pwd, Promise promise) {
        try {
            String strs = hmac256(data, pwd);
            promise.resolve(strs);
        } catch (Exception e) {
            promise.reject("-1", e.getMessage());
        }
    }

    private static String hmac256(String text, String key) throws NoSuchAlgorithmException, InvalidKeyException  {
        byte[] contentData = Hex.decode(text);
        byte[] akHexData = Hex.decode(key);
        Mac sha256_HMAC = Mac.getInstance(HMAC_SHA_256);
        SecretKey secret_key = new SecretKeySpec(akHexData, HMAC_SHA_256);
        sha256_HMAC.init(secret_key);
        return Util.bytesToHex(sha256_HMAC.doFinal(contentData));
    }
}